A Burgers equation model is applied to predict nonlinear propagation of helicopter high-speed impulsive noise. The Burgers equation model is validated against an analytic solution for a sinusoidal wave and then applied to a model-scale rotor noise. The Euler CFD data is used to extract the starting signal and to validate the prediction obtained by the Burgers equation. It is found that the prediction agrees very well with the CFD data. The sensitivity of the starting position in the proximity of the blade tip to the prediction is investigated. In addition, a difference between linear and nonlinear propagations is shown for long distances. The effect of the atmospheric absorption in comparison with the nonlinear propagation is also examined. Finally, the nonlinearity indicator is used to identify the energy transfer in the frequency domain and to explain the SPL distribution.
Long-range and nonlinear propagation of helicopter high-speed impulsive noise
Nichtlineare Langstreckenausbreitung des von Hubschraubern ausgehenden impulsförmigen Lärms
AHS International Annual Forum, 66 ; 2704-2714
2010
11 Seiten, 9 Bilder, 2 Tabellen, 19 Quellen
Conference paper
English
Long-Range and Nonlinear Propagation of Helicopter High-Speed Impulsive Noise
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